11. The area of high density of particles in the medium at the time of sound transmission is called:
12. The Doppler's effect is applicable for
13. Assertion (A): Radio waves bend in a magnetic field.
Reason (R): Radio waves are electromagnetic in nature.
Reason (R): Radio waves are electromagnetic in nature.
14. To hear a clear echo, the minimum distance between the reflecting surface and the observer should be
15. What is the distance between two consecutive compressions in a longitudinal wave?
16. What causes sound?
17. Which of the following is not a transverse wave?
18. One important characteristic of sound is 'Pitch', which depends upon
19. Dilution occurs where there is air pressure-
20. The repeated reflection that results in persistance of sound is called:
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